다중 노즐 배열에서 희박 예혼합 수소/메탄/공기 화염의 강제 응답 특성

Abstract

The present study experimentally investigates the effect of hydrogen enrichment on the forced response of multi-element lean-premixed H2/CH4/air flame ensemble. The linear response of flames characterized by the flame transfer function (FTF) is obtained under a forcing amplitude of 5% and forcing frequencies from 60 Hz to 800 Hz. As increasing hydrogen contents up to pure hydrogen, the cut-off frequency slightly increases which can lead to self-excited instabilities at high-frequency mode, and the time delay decreases due to the compactness of flame structure.